1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/win/remove_app_compat_entries.h"
#include <algorithm>
#include <string_view>
#include <vector>
#include "base/containers/fixed_flat_set.h"
#include "base/files/file_path.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/win/registry.h"
void RemoveAppCompatEntries(const base::FilePath& program) {
if (!program.IsAbsolute()) {
return;
}
base::win::RegKey key;
// Read the current layers value and parse it into tokens.
std::wstring layers;
if (key.Open(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows "
L"NT\\CurrentVersion\\AppCompatFlags\\Layers",
KEY_QUERY_VALUE | KEY_SET_VALUE) != ERROR_SUCCESS ||
key.ReadValue(program.value().c_str(), &layers) != ERROR_SUCCESS ||
layers.empty()) {
return;
}
if (RemoveCompatLayers(layers)) {
if (layers.empty()) {
key.DeleteValue(program.value().c_str());
} else {
key.WriteValue(program.value().c_str(), layers.c_str());
}
}
}
bool RemoveCompatLayers(std::wstring& layers) {
std::vector<std::wstring_view> tokens = base::SplitStringPiece(
layers, L" ", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
if (tokens.empty()) {
return false; // Nothing to remove.
}
static constexpr std::wstring_view kMagicToken(L"~");
if (tokens.size() == 1 && tokens.front() == kMagicToken) {
// The input is nothing but the leading token.
layers.clear();
return true;
}
// Remove all known compatibility mode layer names.
static constexpr auto kCompatModeTokens =
base::MakeFixedFlatSet<std::wstring_view>({
L"NT4SP5", L"VISTARTM", L"VISTASP1", L"VISTASP2",
L"WIN10RTM", L"WIN2000", L"WIN4SP5", L"WIN7RTM",
L"WIN7SP1", L"WIN8RTM", L"WIN81RTM", L"WIN95",
L"WIN98", L"WINSRV03SP1", L"WINSRV08SP1", L"WINSRV16RTM",
L"WINSRV19RTM", L"WINXPSP2", L"WINXPSP3",
});
const auto to_remove =
std::ranges::remove_if(tokens, [](const std::wstring_view& token) {
return kCompatModeTokens.contains(token);
});
if (to_remove.empty()) {
return false; // No changes made.
}
tokens.erase(to_remove.begin(), to_remove.end());
if (tokens.empty() || (tokens.size() == 1 && tokens.front() == kMagicToken)) {
layers.clear();
} else {
layers = base::JoinString(tokens, L" ");
}
return true;
}
|
